cassandra counter 类型使用注意事项，cassandracounter
1. Define a counter in a dedicated table only and use the counter data type. You cannot index, delete, or re-add a counter column. All non-counter columns in the table must be defined as part of the primary key.
2. To load data into a counter column, or to increase or decrease the value of the counter, use the UPDATE command. Cassandra rejects USING TIMESTAMP or USING TTL in the command to update a counter column.
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